Blood pressure interacts with APOE ε4 to predict memory performance in a midlife sample

Area of Science:

• Neuroscience
• Cardiology
• Genetics

Background:

• Elevated blood pressure and the Apolipoprotein E4 (APOE ε4) allele are independent risk factors for Alzheimer's disease.
• Cognitive decline is a growing concern, particularly in middle-aged populations.

Purpose of the Study:

• To investigate the combined effect of APOE ε4 and elevated blood pressure on cognitive performance in healthy middle-aged adults.
• To determine if prehypertensive blood pressure levels in APOE ε4 carriers are associated with cognitive deficits.

Main Methods:

• 975 cognitively healthy participants (aged 30-54) were genotyped for APOE.
• Assessed cardiometabolic risk factors, including blood pressure (BP).
• Measured cognitive function using standardized tests (Trail Making Test, Wechsler Memory Scale).

Main Results:

• The APOE ε4 allele interacted with systolic blood pressure (SBP) to predict episodic memory performance.
• Elevated SBP was associated with poorer memory in APOE ε4 carriers.
• This association was significant even at prehypertensive SBP levels (≥130 mmHg).

Conclusions:

• The combined presence of APOE ε4 and elevated SBP is linked to reduced cognitive performance in healthy middle-aged adults.
• These factors may synergistically impact memory function before clinical impairment.
• Future research should explore BP control interventions in APOE ε4 carriers to mitigate cognitive decline risk.